According to a post over at Donanimhaber.com, AMD is preparing to add another APU to its FM1 socket lineup, the A4-3420.

The same A4-3420 APU has been around for a while, as an OEM part, but now it appears that this dual-core APU will now also hit retail. As noted, the A4-3420 is a dual-core APU clocked at 2.8GHz with a total of 1MB of L2 cache. It features Radeon HD 6410D graphics clocked at 600MHz and packed with 160 stream processors. It also comes with support for DDR3-1600MHz memory thanks to its dual-channel memory controller.

The A4-3420 is pretty much an update to the A4-3400 with a slightly 100MHz higher core clock and higher GPU clock. The TDP is still 65W.

The new A4-3420 APU should hit retail/e-tail with a US $65 price tag. You can check out the original post here.

AMD plans to do a little refresh of its desktop A-series Llano APUs that will include three new APUs, the A8-3820, A6-3620 and the A4-3420. As you could have guessed from the names, we are talking about two quads and one dual-core APU that will replaced the A8-3800, A6-3600 and the A4-3400.

The new APUs are pretty much the same as the ones that they are meant to replace but with a slightly higher clock. The A8-3820 will be clocked at 2.5GHz with a 2.8GHz Turbo and will have the same HD 6550D GPU part. The A6-3620 ticks at 2.2GHz with a 2.5GHz Turbo and has the same HD 6530D GPU part, while the A4-3420 works at 2.8GHz and has the same HD 6530D GPU part. All three new parts have the 65W TDP, same as their predecessors.

The A8-3800, A6-3600 and the A4-3400 will coexist with the new ones until the end of Q2 2012. After Q2 2012, AMD won't be having any more orders for these. Of course, we expect the mentioned trio to have a slight price drop as soon as the refresh shows up in the market.

It is also important to know that Q1 2012 is the launch timeframe of the A6-3670K, while the A8-3870K is scheduled to ship in Q4 2011.